This verse refers to animal sacrifices made by believers in God in Old Testament times, which covered their sins temporarily until the death of Christ came about.
This can be stated in active form. Alternate translation: "the high priest brings into the holy place the blood of the animals that the priests killed for sins" (See: [[rc://en/ta/man/jit/figs-activepassive]])
This can be stated in active form. Alternate translation: "while the priests burn the animals' bodies" (See: [[rc://en/ta/man/jit/figs-activepassive]])